January Jones: Son's Father Is No One's Business

January Jones, star of "Mad Men", has said she refuses to give away the identity of the man who fathered her son, Xander, because it's no one's business.

The 35-year old actress says she's just heeding advice from Jack Nicholson.

"Jack Nicholson once told me: 'You should never give your personal life away, otherwise people will pick you apart. They'll never believe in your character,'" Jones said.

Jones has taken some flack in the past--and most recently in a New York Times piece--for being "cold", much like her "Mad Men" character Betty Draper. The fact that she doesn't want people prying into her personal life seems to be at the root of her reputation, though she isn't alone in her preferences. Many stars who spend a lot of time in the public eye would rather keep quiet about their relationships and family, and who can blame them?